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Very easy to replace on the lawn mower. Bought it so I could have two blades in order to swap them at the end of each season. I could then take the other to get sharpened and put the fresh on. No need to worry about it at the beginning of the following season.

Best Value!! I've tried the cheaper blades. Don't waste your time and money

This blade creates better air flow eliminating most clogs in the chute. And the heavier metal eliminates a lot of damage from hitting hard objects, and requires less sharpening. In case you don't now, heat softens metal by removing the temper or hardening process. The thicker metal will not overheat as fast during the re-sharpening process. That pretty red glow and discolored metal may look good, but it is a indication the metal is being over heated. Slow and easy combined with the heavier blade will get the best results.
No, I am not associated with Sears or any of their suppliers. When I find a good thing, I like to share it. Thanks for reading, hope it helps. GOD BLESS!